改性赤泥协同膨胀型阻燃剂阻燃聚乙烯

以聚磷酸铵（APP）、季戊四醇（PER）和三聚氰胺（MEL）复配的膨胀型阻燃体系（IFR）为主要阻燃剂，表面改性后的赤泥（Ti-MRM）作为协效剂阻燃聚乙烯（PE），采用熔融共混法制备PE基阻燃复合材料（PE/IFR-Ti-MRM）。通过热重分析仪（TGA）、垂直燃烧仪（UL-94）、极限氧指数测定仪（LOI）及扫描电镜（SEM）等对其热氧稳定性、燃烧等级、阻燃性能和残炭形貌进行了表征与分析。结果表明：加入改性赤泥的PE/IFR-Ti-MRM复合材料形成的炭层更加致密和连续，当最优配比时，复合材料的极限氧指数达到32.2，燃烧等级达到V-0级；而PE/IFR阻燃复合材料的极限氧指数只能达到27.5，燃烧等级为V-2级。

Red mud modified synergistic intumescent flame retardation to retardant polyethylene

The flame-retardant composites based on polyethylene (PE), which uses intumescent flame retardant (IFR) composed of ammonium polyphosphate (APP), pentaerythritol (PER) and melamine, and using surface-modified red mud (Ti-MRM) as a synergist, were prepared by melt blending technique. The thermal oxygen stability, combustion performance, flame retardant and morphology of char residue were investigated by TGA, UL-94, LOI and SEM, respectively. It was indicated that the carbon layer of the post burning red mud modified PE/IFR-Ti-MRM composites was denser and more continuous. Under optimum proportion, the LOI and UL-94 of PE/IFR-Ti-MRM composites reached 32.2 and V-0 level, while those of PE/IFR composites were 27.5 and V-2 level, respectively.